*{
	/* 内边距为0 */
	padding:0;
	
	margin:0;
}
input{
	border: 0;
}
#outer{ /*外部轮廓*/
	width:380px;
	height:40rem;
	background-color: black;
	/*居中*/
	margin:0 auto;
	border-radius: 30px;
}
.screen{
	width:380px;
	height:180px;
	position:relative;
}
.showNum{
	color:white;
	font-size: 50px;
	position: absolute;
	right:20px;
	bottom: 1.25rem;
}
.buttons{
	background-color:grey;
	padding:10px;
	height:440px;
	display: flex;
	border-bottom-left-radius: 30px;
	border-bottom-right-radius: 30px;
	/*自动换行*/
	flex-wrap: wrap;
	justify-content: space-between;
	align-content: space-between;
	
}
.buttons > input{
	width: 80px;
	height: 80px;
	background-color: rgb(51,51,51);
	border-radius: 50%;
	color:white;
	font-size:28px;
	
}
.btn1{
	color:black;
	background-color: rgb(255,222,173);
}
.btn2{
	background-color: rgb(165,164,164);
}
.buttons>input:active{
	filter: brightness(140%);
}